<!doctype html>
<html>
  <head>
    <title>XMLHttpRequest: overrideMimeType() in LOADING state</title>
    <meta charset="utf-8">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method" data-tested-assertations="/following::ol/li[1]" />
  </head>
  <body>
    <div id="log"></div>
    <script>
      var test = async_test();
      test.step(function() {
        var client = new XMLHttpRequest();
        client.onreadystatechange = test.step_func(function() {
          if (client.readyState === 3){
            assert_throws_dom("InvalidStateError", function(){
              client.overrideMimeType('application/xml;charset=Shift-JIS');
            });
          }else if(client.readyState===4){
            assert_equals(client.responseXML, null);
            test.done();
          }
        });
        client.open("GET", "resources/status.py?type="+encodeURIComponent('text/plain;charset=iso-8859-1')+'&content=%3Cmsg%3E%83%65%83%58%83%67%3C%2Fmsg%3E');
        client.send();
      });
    </script>

  </body>
</html>
